Windows Vista \ Windows 7 \ Windows Server 2008 folder permissions

My C# Log File or Configuration File throws a System.UnauthorizedAccessException in Vista / Windows 7 / Windows Server 2008!

I am sure most people have encountered an Access Exception in C# .Net after installing an application that was:

• Written to run on Windows XP

• Written to run Windows Server 2003

• Written to run on an even earlier version of Windows...

after installing it on a :

• Windows Vista computer

• Windows 7 computer

• Windows Server 2008 server

System.UnauthorizedAccessException

at LogOMatic.Logger.Append(String message, Priority level, Priority logPriorityLevel)

at SyncInvokeMemConnect(Object , Object[] , Object[] )

at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)

at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)

at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)

at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)

at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

Back in the good old days of windows application development files could be written willy-nilly across the hard drive! They were glorious days, but all good things must come to an end.

Modern windows applications (Windows Vista, Windows 7, Windows Server 2008) are expected to only read and write files to certain predefined folder paths.

http://msdn.microsoft.com/en-us/library/system.environment.specialfolder%28VS.100%29.aspx

In the good old days we used to use the default execution path or the assembly path to reference our configuration or log files like so:

// THE OLD XP WAY
String assmLoc = Assembly.GetExecutingAssembly().Location;

Now we need to use the Environment.SpecialFolder class.

If you are running a client side application you can use the ApplicationData special folder like the following example:

// New UAC Way
String APPLICATION_NAME = "TEST";

String assmLoc = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)+"\\"+APPLICATION_NAME;

This will put your configuration or log file in the hidden folder:

Windows Vista / Windows 7 / Windows Server 2008:

C:\ProgramData\\Application Data\TEST

Windows XP / Windows Server 2003:

C:\Documents and Settings\\Application Data\TEST

If you are running a windows service or WCF (Windows Communication Foundation) applciation (like a SOAP web service) you will need to use the CommonApplicationData special folder entry.

//New UAC way for WCF or Services
String APPLICATION_NAME = "TEST";

Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData)+"\\"+APPLICATION_NAME

This will put your configuration or log files into the Hidden folder C:\ProgramData\ (could be on a different partition depending on your server configuration):

Windows Vista / Windows 7 / Windows Server 2008:

C:\ProgramData\TEST

Windows XP / Windows Server 2003:

C:\Documents and Settings\TEST

About Synergist Software
Synergist Software is a Calgary, Alberta (Canada) based software company focused on Rich Internet Application (RIA) development.
Please visit us at:
http://www.synergist.ca

How to Debug WCF

In this short tutorial I will show you how to “Attach to process...” a WCF web service using Visual Studio and IIS6 or IIS7

There are a few minimum requirements that must be met in order to attach to a WCF ( Windows Communication Foundation ) service process:

1. You must add the following entry to your:
   Web.config
   or

   app.config
   file to enable debugging:
   

2. You must be running at least Visual Studio Pro, Premium, and Ultimate editions
   Sorry, no debugging in Express ( at least not for C# )
   

3. These instructions only work with IIS6 or IIS7

There are also some limitations of debugging WCF that should be considered.

Once you have everything setup correctly ( you may need to restart IIS ) you can open visual studio and select:

Tools -> Attach to Process...

(Ctrl + Alt + P )

Check off both the Show processes... check boxes at the bottom of the dialog:

• Show processes from all users

• Show processes in all sessions

And find the process named:

w3wp.exe

NOTE:
If the process w3wp.exe does not appear in the list. Try running the web service using the WCF Test Client. After the service is run the w3wp.exe process should appear.

Attach the debugger to that process and you should be able to step through your code.

References:

http://msdn.microsoft.com/en-us/library/bb157687.aspx

About Synergist Software
Synergist Software is a Calgary, Alberta (Canada) based software company focused on Rich Internet Application (RIA) development.
Please visit us at:
http://www.synergist.ca

Configure WCF on IIS7 and Windows Server 2008

Last week I needed to migrate a C# .Net WCF (Windows Communication Foundation) application from:

• Microsoft Windows Server 2003 machine running IIS version 6
  
  TO
• Microsoft Windows Server 2008 machine running IIS version 7

I have never had the opportunity to work with Server 2008 or IIS7 before so naturally I ran into a few bumps in the road. Hopefully this article will save you a few hours of head pounding that I went through.

Problem #1:
IIS not recognize my SVC service files!

When I tried to load up my service file:
http://www.localhost/MyTestService/service.svc

I received the following error message:

HTTP Error 404.3 - Not Found

The page you are requesting cannot be served because of the extension configuration. If the page is a scr

ipt, add a handler. If the file should be downloaded, add a MIME map.

You can see the reason behind the problem if you open up the IIS Manager:
Start -> Administrative Tools -> Internet Information Services Manager

And then click the Default Web Site (or your website instance) and in the Feature View open the Handler Mappings.

When you scroll through the list of Handler Mappings you will notice that there are no listings for the SVC extension.

Its hard to run a WCF web service on IIS if the web service SVC extension is not being recognized! I already had the .Net framework 3 installed on the Server 2008 machine so it did not make sense to why it was not working. I tried to manually add the SVC extension to the MIME maps but that did not work.

Here is how I was able to resolve this issue:

1. I opened up the Programs and Features of the Windows Server 2008.
   Start -> Control Panel -> Programs and Features
   
   
2. I clicked on the Turn Windows Features on or off link on the left hand side of the Programs and Features window.
   

   

3. The Server Manager window appeared.
   So next I selected the Features tree branch and clicked the Add Feature button on the right side of the window.
   

   

4. The Add Features Wizard window appeared.
   I expanded the tree branch labeled:
   .Net Framework 3.0 Features
   
   And then the tree branch labeled:
   WCF Activation
   
   I checked off all of the Check Boxes under WCF:
   HTTP Activation Non-HTTP Activation
   
   
   

   

   
   
5. Finally I clicked the Install button. After several minutes of installing away I was ready to test if my changes had worked.
   
   
6. You can insure that the SVC handler mapping is properly configured by opening up the IIS Manager:
   Start -> Administrative Tools -> Internet Information Services Manager
   
   And then click the Default Web Site (or your website instance) and in the Feature View open the Handler Mappings.
   
   If you scroll down the list you should see the SVC handlers have been configured.
   
   
   
   
   

Hopefully this will help someone to overcome this issue with a clean Server 2008 and IIS7 installation... or at the very least it will help to remind me how I got it working the next time I need to handle this.

About Synergist Software
Synergist Software is a Calgary, Alberta (Canada) based software company focused on Rich Internet Application (RIA) development.
Please visit us at:
http://www.synergist.ca